Horton

Re: snapshot too old issues, first around wraparound and then more.

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Peter Geoghegan <pg@bowt.ie>
Cc: Robert Haas <robertmhaas@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, Kevin Grittner <kgrittn@gmail.com>
Date: 2020-04-01T18:18:55Z
Lists: pgsql-hackers

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Hi,

On 2020-04-01 11:04:43 -0700, Peter Geoghegan wrote:
> On Wed, Apr 1, 2020 at 10:28 AM Robert Haas <robertmhaas@gmail.com> wrote:
> > Is there any chance that you're planning to look into the details?
> > That would certainly be welcome from my perspective.

+1

This definitely needs more eyes. I am not even close to understanding
the code fully.


> I had a few other things that I was going to work on this week, but
> those seems less urgent. I'll take a look into it, and report back
> what I find.

Thanks you!

I attached a slightly evolved version of my debugging patch.


Greetings,

Andres Freund

Commits

  1. Remove the "snapshot too old" feature.

  2. Improve timeout.c's handling of repeated timeout set/cancel.

  3. Fix two bugs in MaintainOldSnapshotTimeMapping.